<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>拥有真正值的一切均为 true</title>
</head>

<body>
    <p id="demo"></p>
    <script>
        var b1 = Boolean(100);
        var b2 = Boolean(3.14);
        var b3 = Boolean(-15);
        var b4 = Boolean("Hello");
        var b5 = Boolean('false');
        var b6 = Boolean(1 + 7 + 3.14);

        document.getElementById("demo").innerHTML =
            "100 是 " + b1 + "<br>" +
            "3.14 是 " + b2 + "<br>" +
            "-15 是 " + b3 + "<br>" +
            "任何（非空）字符串是 " + b4 + "<br>" +
            "即使字符串 'false' 也是 " + b5 + "<br>" +
            "任何表达式（除了零）是 " + b6;
    </script>
</body>

</html>